Simtek Corporation, headquartered in Colorado Springs, CO, was an early leader in the development of SONOS memory technology which it used in its nvSRAM product line which featured a SONOS Flash memory coupled with an SRAM shadow memory to achieve both speed and non-volatility. The company was acquired by Cypress Semiconductor in September 2008. Simtek was a fabless company that relied on wafer foundry manufacturing support from Chartered Semiconductor, , and Cypress.